src/java.base/aix/classes/sun/nio/ch/DefaultPollerProvider.java

*** 32,13 ***
--- 32,17 ---
  class DefaultPollerProvider extends PollerProvider {
      DefaultPollerProvider() { }
  
      @Override
      Poller readPoller(boolean subPoller) throws IOException {
+         if (subPoller)
+             throw new UnsupportedOperationException();
          return new PollsetPoller(true);
      }
  
      @Override
      Poller writePoller(boolean subPoller) throws IOException {
+         if (subPoller)
+             throw new UnsupportedOperationException();
          return new PollsetPoller(false);
      }
  }